To remove the background graphics, go to the “Design” tab in the ribbon and click the “Reset Background” button in the “Background” group.You can also use the “Format Background” option to customize the background further, such as by adjusting the transparency or adding a gradient. To add or change the background graphics, go to the “Design” tab in the ribbon and use the buttons and options in the “Background” group to insert a picture or solid color as the background.Click on the slide master or layout master that you want to edit.In the “Slide Master” view, you will see a list of the slide masters and layout masters in the presentation.Click the “Slide Master” button in the “Presentation Views” group.Open the PowerPoint presentation and click the “View” tab in the ribbon.To edit background graphics in a PowerPoint master, follow these steps: Home » PowerPoint » How do I edit background graphics in PowerPoint master?